/*
 *  This file is part of the XForms library package.
 *
 *  XForms is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU Lesser General Public License as
 *  published by the Free Software Foundation; either version 2.1, or
 *  (at your option) any later version.
 *
 *  XForms is distributed in the hope that it will be useful, but
 *  WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public License
 *  along with XForms.  If not, see <http://www.gnu.org/licenses/>.
 */


/**
 * \file sysdep.c
 *
 *  This file is part of the XForms library package.
 *  Copyright (c) 1996-2002  T.C. Zhao and Mark Overmars
 *  All rights reserved.
 *
 *  X independent but system (SysV, BSD) or OS dependent utilities.
 *
 *  listdir.c contains another part of the system dependent stuff,
 *  namely the directory structure of the system.
 *
 *  check out local.h, which defines some flags that might affect
 *  this file
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#include "include/forms.h"
#include "flinternal.h"
#include <string.h>
#include <stdlib.h>
#include <sys/types.h>
#include <time.h>

#ifndef FL_WIN32
#include <sys/time.h>
#include <unistd.h>
#include <pwd.h>
#else
#include <sys/timeb.h>
#include <process.h>
#endif

#include "local.h"

/***********************************************************
 * fl_whoami() returns the username
 **********************************************************/

#ifndef FL_WIN32
const char *
fl_whoami( void )
{
#ifndef __VMS
    struct passwd *passwd = getpwuid( getuid( ) );
    const char *name = passwd ? passwd->pw_name : "Unknown";
    endpwent( );
#else
    const char *name = getenv( "USER" );
#endif
    return name ? name : "unknown";
}
#else /* WIN/NT platform */
const char *
fl_whoami( void )
{
    static char buf[ 32 ];
    int len = 32;

    return GetUserName( buf, &len ) ? buf : "unknown";
}
#endif


/***************************************************
 * fl_now() returns today's (local) date in ASCII format
 ***************************************************/

const char *
fl_now( void )
{
    time_t t = time( 0 );
    static char buf[ 64 ];

    fli_sstrcpy( buf, asctime( localtime( &t ) ), sizeof buf );
    if ( buf[ strlen( buf ) - 1 ] == '\n' )
        buf[ strlen( buf ) - 1 ] = '\0';
    return buf;
}


/*****************************************************************
 * fl_msleep() is similar to sleep(), but with milli-second argument
 ******************************************************************/

#ifdef __VMS
#include <lib$routines.h>

int
fl_msleep( unsigned long msec )
{
    float wait_time = 1.0e-3 * msec;
    ( void ) lib$wait( &wait_time );
    return 0;
}

#else

/***************************************
 * Yielding the processor for msec  milli-seconds
 ***************************************/

int
fl_msleep( unsigned long msec )
{
#ifdef __EMX__
    _sleep2( msec );        /* more accurate than select/sleep in OS2 */
    return 0;
#else
#ifdef FL_WIN32
    _sleep( msec );
    return 0;
#else
#ifdef HAVE_NANOSLEEP
    struct timespec timeout;

    timeout.tv_nsec = 1000000 * ( msec % 1000 );
    timeout.tv_sec = msec / 1000;

    return nanosleep( &timeout, NULL );
#else
#ifdef HAVE_USLEEP
    return usleep( msec * 1000 );
#else                           /* seems everybody has select these days */
    struct timeval timeout;

    timeout.tv_usec = 1000 * ( msec % 1000 );
    timeout.tv_sec = msec / 1000;

    return select( 0, NULL, NULL, NULL, &timeout );
#endif
#endif
#endif
#endif
}

#endif /* VMS */


/******* End of fl_msleep() ***************************/


#if defined __VMS && __VMS_VER < 70000000

/***************************************
 * Thanks to David Mathog (mathog@seqaxp.bio.caltech.edu) for
 * stealing it from the X11KIT distribution
 *
 *      gettimeofday(2) - Returns the current time
 *
 *      NOTE: The timezone portion is useless on VMS.
 *      Even on UNIX, it is only provided for backwards
 *      compatibilty and is not guaranteed to be correct.
 ***************************************/


#include <timeb.h>

int
gettimeofday( struct timeval  * tv,
              struct timezone * tz )
{
    timeb_t tmp_time;

    ftime( &tmp_time );

    if ( tv != NULL )
    {
        tv->tv_sec = tmp_time.time;
        tv->tv_usec = tmp_time.millitm * 1000;
    }

    if ( tz != NULL )
    {
        tz->tz_minuteswest = tmp_time.timezone;
        tz->tz_dsttime = tmp_time.dstflag;
    }

    return 0;

}
/*** End gettimeofday() ***/

#endif /* defined __VMS && __VMS_VER < 70000000 */


/*************************************************************
 * Return the system time since a fixed point in time (On unix
 * systems, this point is typically 01/01/70).
 * Most useful for elapsed time.
 ************************************************************/

void
fl_gettime( long * sec,
            long * usec )
{
#ifndef FL_WIN32
    static struct timeval tp;
#ifdef opennt
    static unsigned long tzp;
#else
    static struct timezone tzp;
#endif

    gettimeofday( &tp, &tzp );
    *sec  = tp.tv_sec;
    *usec = tp.tv_usec;
#else
    struct _timeb _gtodtmp;
    _ftime( &_gtodtmp );
    *sec  = _gtodtmp.time;
    *usec = _gtodtmp.millitm * 1000;
#endif
}


/***************************************
 ***************************************/

long fli_getpid( void )
{
    return getpid( );
}




/*
 * Local variables:
 * tab-width: 4
 * indent-tabs-mode: nil
 * End:
 */